Three papers published in Nature Physics in 2009 revealed the intriguing three- and four-body bound states arising from the predictions by Vitaly Efimov nearly half a century ago. But some of these findings continue to puzzle the few-body physics community.
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Chin, C., Wang, Y. Bound to be universal?. Nature Phys 11, 449–451 (2015). https://doi.org/10.1038/nphys3352
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DOI: https://doi.org/10.1038/nphys3352
